Sounds normal, how many k's on the car?
Adjust throttle cable, clean throttle body, clean everything, that's all you can do.
Clean injectors. Fuel filter. Etc.
After resetting ecu, should normalize after time.
With revs dropping when you stab the throttle quickly, you will always get idle drop before rpm rise.
Reason for this is delay from mechanical throttle cable.
If drive by wire, no delay, is better.
Cable puts more air in, takes a fraction of time for sensors and ecu to adjust fuel.
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